/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Copyright (c) 2023 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file has been modified by Huawei to verify type inference by adding verification statements.
*/

// === tests/cases/compiler/promiseTest.ts ===
declare function AssertType(value:any, type:string):void;
interface Promise<T> {
    then<A>(success?: (value: T) => Promise<A>): Promise<A>;
    then<B>(success?: (value: T) => B): Promise<B>;
    data: T;
}

let p: Promise<number> = null;
AssertType(p, "Promise<number>");
AssertType(null, "null");

let p2 = p.then(function (x) {
AssertType(p2, "Promise<number>");
AssertType(p.then, "{ <TResult1 = number, TResult2 = never>(?(number) => union, ?(any) => union): Promise<union>; <A>(?(number) => Promise<A>): Promise<A>; <B>(?(number) => B): Promise<B>; }");
AssertType(function (x) {    return p;}, "(number) => Promise<number>");
AssertType(x, "number");
AssertType(p.then(function (x) {    return p;} ), "Promise<number>");

AssertType(p, "Promise<number>");
    return p;

} );

let x = p2.data; // number
AssertType(x, "number");
AssertType(p2.data, "number");



